In nature reptiles can take minerals with from different sources, eating soil or sand attached to the bait, licking a swallowtail rock. On the contrary, in captivity reptiles tend to lack of minerals that leads to a failure of health and growth. Mineral blocks of harp craft always supply the lack minerals in captivity, support the healthy growth.
For tortoises, aquatic turtles, geckos, etc. use. If animal won't bite (or lick), just give it mixed with bait and crushed shallow.
Contained trace elements: Aluminum, zinc, potassium, strontium, copper, iron iodine cobalt, silicon, phosphorus, lead, nickel bromide titanium, barium, beryllium bizarre selenium, chromium, other 44 trace elements. Containing trace elements 0.03% or more in total.

Guaranteed Analysis:
● Calcium > 30%
● Sodium > 2%
● Sulfur > 5%
● Magnesium > 0.5%